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OALib Journal期刊
ISSN: 2333-9721
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扇三角洲前缘储层构型精细解剖——以辽河油田曙2-6-6区块杜家台油层为例
Keywords: 曙2-6-6区块,杜家台油层,扇三角洲前缘,储层构型,识别标志,定量规模
Abstract:
？扇三角洲储层是一类重要的油气储层，其可动剩余油储量占我国碎屑岩储层可动剩余油储量的17.4%。目前国内关于扇三角洲储层，特别是扇三角洲前缘储层的构型研究甚少，难以满足此类油藏剩余油分布预测的需要。为此，以辽河油田曙2-6-6区块杜家台油层为例，应用岩心、测井和动态资料，分析了扇三角洲前缘储层构型单元的特征，明确了构型的分级系统，开展了复合砂体和单一砂体级次的构型解剖。研究表明:①研究区发育的储层构型单元包括辫状水道、河口坝和溢岸，不同构型单元形成的复合砂体存在3种平面分布样式。②复合砂体内部单一砂体的识别主要依据其垂向和侧向识别标志，其中垂向识别标志包括钙质夹层和泥质夹层2种，侧向识别标志包括曲线特征区域差异、砂体侧向叠置等6种。③不同类型单一砂体的规模分布存在差异，其中辫状水道厚度介于0.8～6.6m之间，宽度介于100～400m之间；河口坝厚度介于1.2～6m之间，宽度介于200～710m之间，2类砂体的宽厚之间均呈现较好的指数关系。最终，依据研究区储层构型的定性及定量解剖成果，建立了符合地质模式的三维构型模型，为寻找剩余油及挖潜提供了可靠的地质依据。
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